The date of the sqlite-files is changed, but their weight is unchanged. I also don’t see “0 bytes removed” in the detail of CCleaner.
Besides, in the menu of Waterfox all the history of my navigation remained.
I was using the portable version of CCleaner. So I installed an exe version and left all the default settings. I then added to the “pure” ini file the two lines in question … in vain, no change !
Thank you anyway.